<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <meta http-equiv="X-UA-Compatible" content="ie=edge">
  <title>javascript</title>
  <style>
    * {
      margin: 0;
      padding: 0;
      box-sizing: border-box
    }
    body {
      font-size: 14px;
      padding: 20px;
    }
    ul li {
      line-height: 30px;
    }
  </style>
</head>
<body>
  <ul>
    <li></li>
  </ul>
</body>
<script src="https://cdn.bootcss.com/vue/2.6.8/vue.js"></script>
<script>
  function $ajax(num) {
    return new Promise((resolve, reject) => {
      setTimeout(() => {
        if (num > 4) {
          resolve('ok')
        } else {
          console.log(3)
        }
      }, 2000)
    }).catch(err => {
      console.log(323)
    })
  }
  async function getData() {
      let res = await $ajax(1)
      console.log(2)
  }
  getData()
</script>
</html>